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Inventory (Tables)
6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
 
June 30, 2018
 
December 31, 2017
Raw materials
$
13,984,000

 
$
8,450,000

Work in process
1,235,000

 
2,061,000

Finished goods
4,464,000

 
2,948,000

 
$
19,683,000

 
$
13,459,000